/Engine/Plugins/Media/ImgMedia/Source/ImgMedia/Public/ImgMediaGlobalCache.h
Find the entry with the specified sequence and index and mark it as the most recently used.
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< FImgMediaFrame, ESPMode::ThreadSafe > * FindAndTouch ( const [FName](API\Runtime\Core\UObject\FName) & Sequence, int32 Index )